A roller vane pump that uses slippers on its rollers to create multiple seals. The cache memory temporarily stores a priority flag in each cache entry, and the priority flag indicates whether data is to be used during execution in the exclusive control section. Two systems of receivers and transmitters and corresponding methods address power allocation, respectively for slow fading channels tracked instantaneously by the system and for fast fading channels known only statistically thereby. The dry insert may also include a plurality of water-swellable filaments. The event records include timestamps indicating when the event record was adjusted and counts indicating the popularity of an event when the event record was adjusted.